Fire-alarm.



N0. 66!,736. Patented Nov. l3, I900. 0. FREYMANN.

FIRE ALARM.

(Application filed Nov. 17, 1B99.|

(No Model.) 2 Sheets-Sheet I.

m: Nonrns puns w, PHOTO-LI TMQ., WASHINGTDI, u. c.

' Patented Nov. l3, I900.

0. FREYMANN.

FIRE ALARM.

(Application filed Nov. 17, 18 99.

2 SheetsSheet 2.

(No Model.)

OSOKAR FREYMANN, OF NEYV YORK,

PATENT OFFICE.

N. Y., ASSIGNOR OF ONE-FOURTH TO CHARLES TOLMAN, OF SAME PLACE.

FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 661,7 36, dated November 18, 1900.

Application filed November 17,1899. Serial No. 737,334. (No model-J T ctZZ whom it 777/6112] concern;

Be it known that I, OSOKAR FREYMANN, of New York, (Brooklyn,) county of Kings, and State of New York, have invented certain new and useful Improvements in Fire-Alarms, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, wherein Figure 1 is a sectional view, partly in ele- IO vation,ofan electric bell-bu tton provided with my improved alarm attachment. Fig. 2 is a horizontal sectional view on line 2 2 indicated in .Fig. l. 3 is a sectional view showing the operating parts of my improved alarm attachment on an enlarged scale. Fig. 4 is a similar view to Fig. 1, showing a somewhat-modified construction of the same device. Fig. 5 is a sectional view showing the operating parts of my improved alarm attachment, like in Fig. 4,0n an enlarged scale,when the contact is closed. Fig. 6 is an isometric View of an apparatus as shown in Figs. 1 and 1in sectional view. Fig. 7 is a sectional view, and Fig. 8 an elevation, of another form of my improved fire-alarm apparatus. Fig. 9 is a sectional view, and Fig. 10 is an elevation, of another modified form of my improved firealarm apparatus; and Fig. 11,a sectional view thereof on line 11 indicated in Fig. 9 and partly a plan View.

Similar characters of reference indicate corresponding parts in all the views of the drawings.

My invention relates to fire alarms or annunciators; and it consists of the hereinafterdescribed fire-alarm apparatus embodying the combination of a rigid and an elastic contact-piece insulated from each other by a piece of non-conducting material having a low meltingpoint, the insulating medium being so located that it is exposed to the effects of temperature from without.

The apparatus of Figs. 1, 2, and 3 shows the application of my invention to an ordinary electric button. In this apparatus, 1 is the globe or cover, and 2 is the button set movably in aperture 3 of the globe 1 and connecting electrically with the contact-piece 4. Nu-

meral 5 designates the other contact-piece,and 5o 6 and 7 are electric wires respectively connected to the contact-pieces 4: and 5 by means of clam p screws S and 9. These contact-pieces are normally apart from each other, breaking the bell-circuit. By pressing the button 2 contact-piece a is brought in closing contact with 5 and the bell-circuit closed. Double-headed pin 11 is secured to contact-piece5 and electrically connected therewith. The shank of this pin passes through the contact-piece 41, being insulated therefrom by sleeve 10. To the other end of pin 11 is secured metallic spring 13, supporting the metallic plate lat, which is shaped correspondingly with the inner surface of button 2. Between this plate H and button 2 is inserted a pad 15, of insulating materialsuch as, for instance, paraffin which at normal temperature is quite hard and apt to resist the pressure of the spring 13, pressing the plate 14 in contact with the button 2. As long as this insulating substance remains in place the bell-circuit is in-- terrupted and the bell rings only when by pressing the button the contact-pieces 4 and 5 are brought together. Then, however, the temperature rises in the place wherein this bu tton is located, the insulating-pad 15 melts. Plate let then comes in contact with button 2, and thereby the bell-circuit closed, the metallic button 2 being electrically connected with the contact-piece 4: and the plate 14 with contact-piece 5 through spring 13 and pin 11, and the bell set ringing. The bell then continues to ring until the contact is again interrupted by insulatingplate 14 from the button. For this purpose the outer hull of the metallic button 2 is removed by unscrewing first the globe l and then screw 16, whereupon a new pad of insulating material 15 can be placed on top of plate let.

In Figs. 4 and 5 a modified construction of my improved alarm apparatus is shown. This apparatus comprises, again, a globe or cover 1, wherein button 2 is set movably in aperture 3 and connected electrically with the elastic contact-piece 4:. The other contact-piece 5 is flat and straight. The contactpieces at and 5 are connected, by means of wires 6 and 7 and clamps S and 9, respectively, to an electric battery. To compensate for the greater distance intervening between the ends of the contact-pieces 1 and 5, ablock :cis set in suitable position upon the contact- 5; eeiwse piece 5 and metallic sleeve 01; is secured to the button 2, its lower edge projecting below the lower surface of the contact-piece 4:. Block 05 and sleeve m are electrically connected with the contact-piece 5 and the metallic button 2, respectively,as shown more clearly in enlarged sectional view, Fig. 5, and when the button 2 is pressed inwardly the edge of sleeve at comes in contact with block 00, and thereby closes the circuit. Pin 11 is electrically connected to the contact-piece 5 and insulated from contact-piece 4:. Spring 13 connects the pin 11 elastically to plate 1 L. Between this plate and the top of the button 2 the insulating-pad 15 is inserted. This apparatus operates in the same manner, as explained with reference to the apparatus shown in Figs. 1, 2, and 3.

The apparatus shown in Fig. 7is construct ed on the same principle as explained with reference to the one shown in Figs. 1, 2, and 3. In this apparatus the plate 14-, closing the contact with the button 2, is secured to pin 17, sliding in tube 18. Button 2 is stationary and is secured to the apparatus by screw 16. Pin 17 serves as connecting medium for the electric contact-piece in the same manner as pin 11 in the apparatus described above.

The construction shown in Figs. 9, 10, and 11 is a modified form of the embodiment of my invention. In this apparatus tube 19 rep resents one of the contact-pieces and pin 21 the other. Tube 19 connects electrically with Tube 19 is protected by the perforated tube 23 of heavy material, it being necessary to make tube 19 of as thin material as possible to increase the sensitiveness of the apparatus. Perforations 22 and 24 are provided in tube 23 to admit the air to come in contact with tube 19. The operation of the apparatus is the same as explained with reference to the apparatus shown in Figs. 1, 2, and 3. When the temperature in the room rises, the insulating-pad 15 is melted, pin 21 comes in contact with tube 19, and thereby closing the electric circuit causes the alarm-bell to ring. The insulating-pad may be replaced by removing the outer tube (tube 19 is open 011 its end) and then a new insulating-pad 15 may be inserted.

I claim as my invention- An electric alarm apparatus having its contact-pieces normally separated, a hollow metallic press-button set upon the upper contact-piece and electrically connected therewith, a metallic pin, electrically connected to the lower contact-piece and passing through an insulated aperture in the upper contactpiece into the cavity of the metallic pressbutton, a metallic spring connected electrically to the pin, a metallic plate set on the spring and a pad of insulating material sufficiently hard at normal temperature to resist the pressure of the spring, and of low melting-point inserted between the plate and the top of the metallic button.

OSOKAR FREYMANN.

Witnesses:

JNo. A. PAULSON, ROBERT VALENTINE MATHEWS. 

